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Cerebral Palsy — Comprehensive Overview

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1. DEFINITION

"A group of permanent disorders of the development of movement and posture, causing activity limitation, that are attributed to non-progressive disturbances that occurred in the developing fetal or infant brain." — International Consensus Panel (2004), cited in Bradley and Daroff's Neurology in Clinical Practice

1. A disorder of movement and posture (weakness, spasticity, dystonia, ataxia, or choreoathetosis) with onset prior to age 1–2 years
2. A non-progressive brain lesion (the disability itself may evolve, but the underlying brain insult does not progress)
3. The brain injury must have occurred during fetal development or within the first 2 years of life
4. Other progressive neurological diseases must be excluded

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2. EPIDEMIOLOGY

• Prevalence: approximately 2–3 per 1,000 live births in developed countries
• Higher rates in premature and low-birth-weight infants
• Rates have remained stable or slightly declined with improvements in neonatal care, though survival of extremely preterm infants has maintained overall numbers

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3. PATHOLOGY

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4. CAUSES / ETIOLOGY

Prenatal (≈70–80% of cases)

• Congenital brain malformations (cortical dysplasia, neuronal migration disorders)
• Intrauterine infections (TORCH: Toxoplasma, Rubella, CMV, Herpes)
• Genetic/chromosomal abnormalities
• Maternal thrombophilia, coagulopathy
• Twin-to-twin transfusion syndrome
• Placental insufficiency / chronic fetal hypoxia

Perinatal (≈10–20%)

• Hypoxic-ischemic encephalopathy (HIE) — previously over-emphasized; accounts for only ~10% of all CP
• Perinatal stroke (most common cause of hemiplegic CP)
• Neonatal meningitis/encephalitis
• Metabolic disturbances (hypoglycemia, hyperbilirubinemia → kernicterus → athetoid CP)
• Prematurity and periventricular leukomalacia (PVL)

Postnatal (≈10%)

• Meningitis, encephalitis
• Traumatic brain injury (including non-accidental trauma)
• Near-drowning, asphyxia
• Stroke in early childhood

Key point: Contrary to older teaching, perinatal asphyxia alone drives only a small fraction of CP cases. The majority have prenatal origins. — Bradley and Daroff's Neurology in Clinical Practice

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5. CLASSIFICATION & TYPES — CLINICAL FEATURES

A. BY MOTOR TYPE

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1. Spastic CP (most common, ~80%)

• Increased muscle tone (velocity-dependent resistance to passive stretch)
• Clasp-knife phenomenon
• Hyperreflexia, clonus, positive Babinski sign
• Weakness, poor selective motor control
• Scissors gait, toe-walking, equinus foot
• Upper limb: thumb-in-palm, wrist flexion, forearm pronation, elbow flexion, shoulder internal rotation

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2. Dyskinetic CP (~15%)

• Involuntary, uncontrolled, recurrent movements
• Two subtypes:
  • Athetoid: slow, writhing, sinuous movements; fluctuating tone; prominent in distal extremities; worsened by voluntary movement and emotion; associated with kernicterus (bilirubin-induced injury to the globus pallidus)
  • Dystonic: sustained or intermittent muscle contractions causing twisting movements and abnormal postures; associated with basal ganglia/thalamic lesions from perinatal asphyxia at term
• Dysarthria is prominent (hypophonia, slurred speech)
• Intelligence is often preserved or near-normal despite severe motor impairment
• Hearing loss (especially sensorineural) with kernicterus
• Gaze palsy (upward gaze palsy in kernicterus — "setting sun" sign)

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3. Ataxic CP (~5%)

• Hypotonia in infancy
• Wide-based, unsteady gait
• Dysmetria, intention tremor
• Poor coordination of voluntary movements
• Nystagmus may be present
• Speech: scanning dysarthria
• Often associated with genetic/congenital causes

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4. Mixed CP

• Combination of spastic + dyskinetic features most common
• Reflects involvement of multiple brain regions

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B. FUNCTIONAL CLASSIFICATION — GMFCS

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6. ASSOCIATED IMPAIRMENTS

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7. DIAGNOSIS

• MRI brain: investigation of choice; identifies underlying structural abnormality in ~80% of cases (PVL, cortical malformations, basal ganglia lesions, porencephaly)
• MRI timing: ideally between 2–8 weeks of life in term infants, earlier in preterm
• EEG: if seizures suspected
• Genetic testing / metabolic workup: if no identifiable structural cause, or features suggesting progressive or hereditary disease (to exclude "CP mimics")
• Ophthalmology/audiology assessment: routine
• GMFCS, MACS (Manual Ability Classification), CFCS (Communication Function Classification): functional classification tools

MRI is more sensitive than CT and should be the first-choice imaging modality. — Bradley and Daroff's Neurology in Clinical Practice

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8. MEDICAL MANAGEMENT

Spasticity Management

• Botulinum Toxin A (BoNT-A): most widely used; blocks acetylcholine release at NMJ → temporary (3–6 months) reduction in focal muscle spasticity; combined with physiotherapy for best effect; repeat injections every 4–6 months
• Phenol / Ethyl alcohol nerve blocks: for focal spasticity in larger muscle groups; longer-lasting but less selective

Intrathecal Baclofen (ITB) Pump

• For widespread spasticity not controlled by oral medications or with unacceptable side effects
• Baclofen infused directly into CSF → effective at fraction of oral dose; bypasses blood-brain barrier
• Pump implanted subcutaneously in abdomen with intrathecal catheter
• Reversible; programmable dose delivery
• Useful in GMFCS IV–V, bilateral spasticity, or spastic-dystonic mixed CP

Selective Dorsal Rhizotomy (SDR)

• Neurosurgical procedure: partial sectioning of dorsal (sensory) nerve rootlets at L1–S2
• Permanently reduces spasticity by interrupting the afferent limb of the stretch reflex arc
• Best candidates: spastic diplegia, GMFCS II–III, age 3–8 years, good strength, no fixed contractures
• Requires intensive post-operative physiotherapy (6–12 months minimum)
• Shown to improve gait and functional outcomes

Dystonia Management (Dyskinetic CP)

• Trihexyphenidyl (anticholinergic): effective for dystonia in some children
• Levodopa trial: important to trial (rule out dopa-responsive dystonia)
• Tetrabenazine: depletes dopamine; useful in hyperkinetic movements
• Clonazepam, baclofen: adjuncts
• Deep Brain Stimulation (DBS): of the globus pallidus internus (GPi); increasingly used for severe dyskinetic CP; improves involuntary movements and quality of life
• Intrathecal baclofen: also effective for mixed spastic-dyskinetic cases

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9. ORTHOPEDIC MANAGEMENT

• Serial casting and splinting
• Ankle-foot orthoses (AFOs), dynamic AFOs
• Hip surveillance programs (X-ray migration percentage monitoring)

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10. PHYSIOTHERAPY MANAGEMENT — DETAILED

Core Principles

• Early intervention is critical — neuroplasticity is greatest in infancy and early childhood
• Goal-directed, task-specific training outperforms passive stretching alone
• Regular reassessment using GMFCS, GMFM (Gross Motor Function Measure), and gait analysis
• Family-centred approach: caregivers trained as active participants

Key Physiotherapy Approaches

1. Neurodevelopmental Treatment (NDT) / Bobath Approach

• Based on normalizing tone and facilitating normal movement patterns through handling techniques
• Therapist uses "key points of control" to inhibit abnormal reflex patterns and facilitate normal movement
• Widely used, though evidence base is evolving

2. Strength Training

• Progressive resistance training improves muscle strength without increasing spasticity
• Functional strength training (e.g., sit-to-stand, stair climbing) more effective than isolated exercises
• Particularly important for ambulatory children (GMFCS I–III)

3. Task-Specific / Activity-Based Therapy

• Repetitive practice of functional tasks (walking, reaching, grasping) drives cortical reorganization
• Based on principles of motor learning theory
• Examples: treadmill training, functional reach training

4. Stretching and Range of Motion

• Passive stretching: prevents contracture development; limited long-term evidence when used alone
• Prolonged positioning (standing frames, night splints, serial casting): more effective than brief stretching for maintaining length
• Serial casting: progressive casting to gradually reduce contractures (e.g., equinus foot) before surgical intervention

5. Orthotic Management

• AFO (Ankle-Foot Orthosis): most commonly prescribed; controls equinus, improves gait pattern and energy efficiency
• Dynamic/hinged AFOs: allow ankle dorsiflexion during swing phase
• KAFO (Knee-Ankle-Foot Orthosis): for crouch gait or knee instability
• HKAFO / RGO (Reciprocating Gait Orthosis): for GMFCS IV–V children learning to walk

6. Gait Training

• Conventional gait training with AFOs
• Treadmill training with or without body-weight support
• Instrumented 3D gait analysis to guide treatment decisions (pre/post-surgery)

7. Constraint-Induced Movement Therapy (CIMT)

• Used in hemiplegic CP
• Constrains the unaffected limb (cast or sling) while intensively training the affected limb
• Drives cortical reorganization and improves upper limb function
• Evidence level: strong (multiple RCTs)
• Pediatric modifications: "mCIMT" (modified CIMT) with bimanual training

8. Aquatic / Hydrotherapy

• Water buoyancy reduces gravitational load, enabling movement that is not possible on land
• Reduces spasticity temporarily; improves ROM, strength, and balance
• Enjoyable for children — promotes motivation and participation

9. Hippotherapy

• Therapeutic horseback riding
• Rhythmic movement of the horse stimulates trunk postural control and balance
• Evidence suggests improvement in GMFCS, balance, and quality of life

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11. NEWER / ADVANCED PHYSIOTHERAPY APPROACHES

1. Robotic-Assisted Therapy

• Lokomat (robotic gait orthosis): provides body-weight-supported treadmill training with robotic limb guidance
• Armeo / Hocoma devices: for upper limb rehabilitation
• Enables high-intensity, repetitive, task-specific training; reduces therapist effort
• Growing evidence base for improving gait speed, step length, and GMFM scores

2. Virtual Reality (VR) and Gaming Therapy

• Immersive VR environments and commercial gaming (Nintendo Wii, Xbox Kinect) used for motor rehabilitation
• Provides task-specific, repetitive training with motivating real-time feedback
• Shown to improve upper limb function, balance, and gait
• Particularly effective in GMFCS I–III; increasingly studied in children with hemiplegia

3. Transcranial Magnetic Stimulation (TMS)

• Non-invasive brain stimulation technique
• Repetitive TMS (rTMS): applied over the motor cortex to modulate excitability
• Inhibitory rTMS over the "unaffected" hemisphere (in hemiplegia) may reduce interhemispheric inhibition and improve contralateral limb function
• Emerging evidence; not yet standard of care

4. Transcranial Direct Current Stimulation (tDCS)

• Weak electrical current applied to the scalp to modulate cortical excitability
• Anodal tDCS over affected motor cortex or cathodal over contralateral hemisphere improves motor learning and upper limb function
• Combined with task-specific therapy for synergistic effect
• Safe and well-tolerated in children

5. Exoskeleton and Wearable Technology

• Soft robotic exosuits (e.g., Harvard Wyss Institute designs) provide assistive force during gait
• Enable community-based rehabilitation
• Biofeedback wearables provide real-time feedback on gait, posture, and muscle activity

6. Functional Electrical Stimulation (FES)

• Electrical stimulation applied to peripheral nerves/muscles during functional tasks
• FES cycling: strengthens lower limb muscles and improves cardiovascular fitness
• Peroneal nerve stimulator: corrects foot drop during walking
• NMES (Neuromuscular Electrical Stimulation): combined with physiotherapy to improve muscle activation and selective motor control

7. Goal-Directed Training (GDT) and HABIT (Hand-Arm Bimanual Intensive Training)

• HABIT: structured bimanual intensive training — effective in hemiplegic CP; complements CIMT
• GDT: therapist and child collaboratively set meaningful, individualized goals using SMART framework; shown to improve participation and motivation

8. Motor Learning–Based Approaches

• COPE (Child-Friendly and Occupation-based Program): occupation-based; uses play and daily activities
• MOVE program: mobility opportunities via education — focuses on functional sitting, standing, walking
• Action Observation Therapy (AOT): child observes a therapist performing movements, activating mirror neurons to facilitate motor learning

9. Selective Dorsal Rhizotomy + Intensive PT

• Post-SDR intensive physiotherapy program (minimum 6–12 months) is mandatory for gains to be realized
• Combination is more effective than either intervention alone

10. Stem Cell Therapy (Experimental)

• Autologous cord blood stem cell infusion being studied
• Early phase trials suggest modest improvements in gross motor function
• Not yet recommended outside clinical trials

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12. MULTIDISCIPLINARY TEAM (MDT)

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13. LIFE SPAN ISSUES

• Children with CP were historically expected to have reduced life expectancy; with modern care, they now survive well into adulthood
• Transition from paediatric to adult services requires careful planning
• Adults with CP face:
  • Premature aging of the musculoskeletal system (increased pain, reduced ambulation)
  • Post-impairment syndrome: fatigue, pain, weakness with aging
  • Increased risk of osteoporosis (especially non-ambulatory individuals)
  • Ongoing need for physiotherapy, pain management, and social support
  • Healthcare transition protocols (AAP guidelines, 2011) recommend structured transition planning from age 12

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SUMMARY TABLE

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